scholarly journals Research on Absolute Positioning Sensor Based on Eddy Current Reflection for High-Speed Maglev Train

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5167
Author(s):  
Xiaobo Hong ◽  
Jun Wu ◽  
Yunzhou Zhang ◽  
Yongxiang He
Keyword(s):  
Eddy Current ◽  
High Speed ◽  
The Novel ◽  
Maglev Train ◽  
Compact Structure ◽  
Absolute Positioning ◽  
Eddy Current Effect ◽  
Speed Range ◽  
The Impact ◽  
Detection Coil

A novel absolute positioning sensor for high-speed maglev train based on eddy current effect is studied in this paper. The sensor is designed with photoelectric switch and four groups of unilateral coplanar code-reading detection coil combination. The photoelectric switch realizes the positioning of the marker plate, and the four groups of detection coils read the mileage code of the mileage sign plate to obtain the absolute mileage information of the vehicle, which effectively reduces the quality and volume of the sensor, and reduces the impact of ice and snow. At the same time, the code-reading reliability and speed adaptability index are proposed. The code-reading reliability of the sensor is analyzed and tested under the fluctuation of levitation guidance, and the positioning error under the speed range of 0–600 km/h is calculated and analyzed. The results show that the novel sensor has the advantages of simple and compact structure. It still satisfies the system’s requirements for absolute vehicle mileage information under the conditions of vehicle operating attitude fluctuations and changes in the full operating speed range.

Design and indirect adaptive fuzzy H∞ control of a novel retarder coupled with eddy current effect and MR effect

2020 ◽  
pp. 1045389X2096318
Author(s):  
Xiaoqin Xu ◽  
Tianyu Zhu ◽  
Shumei Chen ◽  
Cheng Wang
Keyword(s):  
Eddy Current ◽  
High Speed ◽  
Control Process ◽  
Constant Speed ◽  
Current Effect ◽  
Adaptive Fuzzy ◽  
Eddy Current Effect ◽  
Full Speed ◽  
Braking Process ◽  
Mr Effect

To improve the poor braking performance of the traditional eddy current retarder, a novel retarder is developed by coupling the eddy current effect and the magnetorheological effect, which has large torque at low speed and stable torque at high speed. To meet the constant speed requirement in the braking process, the indirect adaptive fuzzy H∞ control strategy is employed to control the rotor speed of the designed retarder. The results show that the proposed retarder has the characteristics of continuously adjustable large torque in full speed section, sensitive control process and constant speed intelligent control.

Impact performance of innovative corrugated polystyrene foam for bicycle helmets

2020 ◽  
pp. 0021955X2096521
Author(s):  
Somen K Bhudolia ◽  
Goram Gohel ◽  
Kah Fai Leong
Keyword(s):  
Energy Absorption ◽  
High Speed ◽  
Head Injuries ◽  
Expanded Polystyrene ◽  
The Novel ◽  
Comparison Study ◽  
Impact Performance ◽  
Bicycle Helmets ◽  
Weight Property ◽  
The Impact

Expanded Polystyrene (EPS) is a common material used to manufacture the inner foam liner of a bicycle helmet due to its outstanding energy absorption characteristics and light-weight property. The current research presents a novel corrugated expanded polystyrene (EPS) foam design concept which is used to enhance the impact dissipation of bicycle helmets from the safety standpoint to reduce head injuries and make them lighter. The baseline comparison study under impact for different foam configurations is compared with a conventional EPS foam sample without corrugation. Corrugated foam designs under current investigation are 12.5–20% lighter and provide up to 10% higher energy absorption. The details of the novel manufacturing concept, CPSC 1203 helmet impact tests, high-speed camera study to understand the differences in the failure mechanisms are deliberated in this paper.

High-Speed Sealift Technology

1998 ◽  
Vol 35 (03) ◽  
pp. 135-150
Author(s):  
Colen Kennell ◽  
David R. Lavis ◽  
Michael T. Templeman
Keyword(s):  
High Speed ◽  
Empirical Method ◽  
Qualitative Assessment ◽  
Sea Transport ◽  
Relative Risks ◽  
Speed Range ◽  
Near Term ◽  
Design Characteristics ◽  
Impact Of Technology ◽  
The Impact

This paper describes a process that is currently being used within DoD and industry to examine the possibilities offered by technology to enhance the transport performance of high-speed commercial and military sealift. Technology projections are presented for both the near-term and the far-term. The impact of technology projections on transport performance properties is assessed both quantitatively and qualitatively. These assessments provide significant insight into the overall transport performance potential of hullforms and other technologies of interest, considerably in advance of detailed design studies. The quantitative assessment uses a derivation of the empirical method published by Kennell[1]4, which provides simple parametric relationships between mission requirements, expressed in terms of speed, range and payload, and design characteristics, expressed in terms of displacement, installed power and fuel weight, to compare the various hullforms and other technologies of interest. The qualitative assessment applies an established decision-making method to ascertain the relative capabilities and relative risks of hullforms and other technologies of interest for significant aspects of sea transport, other than speed, range and payload. While the methods used are generic, the data selected and results presented are aimed at ships capable of rapidly transporting heavy cargo over long distances.

Intelligent Inspection of the High-Speed Train Bogie Flaw Based on Eddy Current

2015 ◽  
Vol 738-739 ◽  
pp. 751-754
Author(s):  
Ji Hui Zhou ◽  
Zhi Yang Liu ◽  
Gang Chen
Keyword(s):  
Eddy Current ◽  
High Speed ◽  
Surface Flaw ◽  
High Speed Train ◽  
Environment Analysis ◽  
Inspection Method ◽  
Eddy Current Effect ◽  
Eddy Current Inspection ◽  
Physical Prototype ◽  
Lift Off

This paper presents a flaw inspection method based on eddy current effect, by comparison of environment analysis and inspection methods for the high-speed train bogie surface flaw. It designed a testing physical prototype and a reasonable control system which was based on eddy current inspection bogie surface flaw, what’s more, it made use of restraining lift-off effect in testing two times, and the result of experiment indicated that method which tested bogie surface flaw was feasible and effective by digital monitor. The method will offer a guarantee for moving of the high-speed train safely and comfortably, and establish a little base to inspect interior flaw and research farther.

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